Why should medicines not be taken without consulting doctors?

(N/A) Medicines are chemical substances that interact with specific receptor sites in the body to produce a therapeutic effect.
$1$. $A$ single medicine can bind to more than one receptor site,potentially causing toxic effects at unintended sites.
$2$. Taking medicines in doses higher than those recommended can lead to harmful or poisonous effects.
$3$. Doctors are trained to assess the patient's condition and prescribe the correct dosage to minimize side effects.
Therefore,medicines should not be taken without consulting a doctor.